Warp stop mechanism for looms



March 2 1926. 1,575,549

H. A. DAVIS WARP STOP MECHANISM FOR LOOMS Filed Oct. 16, 1925 2 Sheets-Shet 1 March 2 1926.

4 H. A. DAVIS WARP STOP MECHANISM FOR LOOMS Filed Oct. 16, 1925 2 Sheets-Sheet 2 k x 6 1 a m m r/ r/ v Patented Mar. 2, 1926.

UNITED STATES 1,575,549 PATENT, OFFICE.

HARRY.A. DAVIS, 01? HOPEDALE, MA$SACHUSETTS, ASSIGNOR T0 DRAPER CORPOBA Y TION, 0F HOPEDALE,MASSACHUSETTS, A CORPORATION OF MAINE.

WAR]? STOP MECHANISM FOR LOOMS.

Application filed October 16, 1925. Serial No.1 62,762.

ToaZZ whom it may concern:

Be it known that I, HARRY A. DAvIs, a

citizen of the United States, and a resident ofI-Iopedale, in the county of lVorcester and State of Massachusetts,l1ave invented an Improvement in WVarp Stop Mechanisms forLooms, of which thefollowing description, inconnection withthe accompanying drawings, is a s aecificatiomlike characters on the drawings representing like parts. I This invention relates to warp stop mechanisms for 1001115 whereby the loom is brought to rest on the occurrence of a warp fault.

lVarp stop mechanisms as now ordinarily employed contain a series of drop wires which are normally supported by the Warp threads during weaving and whena warp thread becomes broken or too slack for Weav in-g purposes, the associated dropwire acts through a vibrator to effect loom stoppage, that the warp fault may be corrected.

in the correction of the warp fault, it is necessary that the weaver ascertain the loca tion of the broken or too slack warp thread, and in case'the warp stop mechanism comprisestwo or more rows 01' banks of drop wires, much delayand uncertainty results in locating the bankofldrop wires in which the warp fault has occurred, and oneof the objects of the present invention is to provide a warp stopmechanism with indicating means for indicating the bank of drop wires where the warp fault has taken place. Usually the weaver runs his hands over the drop wires of the several banks to locate the fallen drop wire, butv in accordance with the present invention, means are provided to indicate at once the bank ofdropwires containing the broken or too slack thread.

Another important feature of the inven tion is to provide a Warp stop mechanism which shall be simple in construction and wherein any one of the vibrators of the several banks of drop wires may be stoppedby a fallen drop wire while the others re main in action until the loom is finally brought to rest.

The invention, novel features and new combination of parts will best be made clear from the following description and the accompanying drawings, of one good form thereof.

In the drawings: Fig. 1 is a side elevation of suflicient portions of a loom containingthe present invention to make clear (the construction and mode ofwoperation thereof;

Fig. 2 is an end elevation, partly in seotion, of the main :portions of. the warpstop mechanism, showing one of theedrop wires in its lowered position; l

.llig. 3 is a perspective view at one end of the warp stop mechanism, and f Fig. f is a side elevation of" the parts indicated in Fig. 3 withone ofthe drop wires shown-in dotted-lines in its loom stopping. position. 7

The advantages of the present invention are best manifested in a .Warp, stop'mechanism of that type wherein a vibrator is associated with each bank of drop wires and is given its oscillating detectingmovemerit during weaving, .In ,thistype of warp stop mechanisms the vibrators of the several banks of drop wires pass through openings of the drop wires which have wide and narrow portions, so that the vibrator may freely partakeof its. oscillating detecting movement in the wider portion of the opening and when any one of the drop Wires of the bankis released byits Warp thread, the vi brator maybe arrested by the narrower portion of the opening, to efiect loom stoppage, The train of mechanism between the warp stop mechanism and the loom stopping device maybe variously contrived, but as indicated in Fig. 1, suchtrain of mechanism is made effective to stop the loom by a shipper knock-oifwhen a warp thread becomes broken or too slack for weaving' purposes.

The loom frame 1 may be of usual con struction and supports the warp beam 2 from which the warp threads 0; are led from the rear towards the front ofthe loom. Mounted on the loom frameis the lay 3, having the lay swords supportedfor rocking movement, and connected tothe lay is a hunter 5 which, in the present instance of the invention is caused. to engage a .dog

6 as the lay moves back, when such dog is' moved into the path of the hunter on the occurrence of a warp fault. The dog 6 and its connection 7 with the shipper knock off 8, the flexible sheathed wire 9 extending between the warp stop mechanism proper and the dog .6 for operatively positioningthe dog on the occurrence of a warp fault, may all be substantially of the same'general character as shown and described in the patent to Louis S. Burbank, No. 1,240,666, September 18, 1917, and as such train of-mechanism may be varied in connection with the actual invention as herein described, further description of these details will be unnecessary.

The warp stop mechanism propercomprises the bracket 10, one at each side of the loom, which may be conveniently supported by posts 11 which pass through a sleeve 12 on each ofthe brackets. I Extending between similar bearings 13 formed on the opposite brackets 10 are the Warp supporting bars 1 1 on which the warp threads at rest during normal weaving operation. a The drop wires 15 have openings 16, the top portion of the opening being narrowed at 17 and through each bank of drop wires extends a vibrator 18 which is of non-circular cross-section, as indicated in Fig. 2. In the present instance of the invention, the drop wires 15 are arranged in four banks, and with each bank is associated a vibrator 18 which has free oscillatory movement in the wide portions of the slots 16 of the drop wires during'weaving. The drop wires 15 are supported by the warp threads a during normal weaving operation, butshouldany one of the warp threads break or become too slack for weaving purposes, the associated drop wire will fall and-by engagement with the narrow portion 17 of the slotin the drop wire,arrest the oscillating movement of the associated vibrator. Mounted for rocking movement in the bracket 10 are the sleeves 19 having secured to eacha vibrator 18. Such connection may be made by forming an opening in the end of the sleeve 19 of thesame 0r substantiallythe same cross-sectional shape as the associated vibrator 18, the construction being such that should the rocking sleeves 19 be rocked or turned, they will impart similar movement to each of the associated vibrators, it being understood that each vibrator 18 has an associated rocking sleeve 19. On the outer end of the sleeve 19 is a cam 20. r

Extending between the upright portions 21 and 22 of the bracket 10 are a series of rock shafts 23, the outer end portions of which project beyond the outer surface of the portion 21 of the bracket, and are there connected to an arm 24, all of which are united to a bar 25, Fig. 3, whereby the rock shafts 23 (of which there are the same numher as vibrators 18) are given'a simultaneous rocking movement. The innerends of each of the rock shafts 23 extend into a hollow portion of the rocking sleeve 19, as indi cated in Fig; 1, to thereby provide for the inner ends of each rock shaft a-rocking bearing. Such rocking movement may be given to the vibrators by any suitable means driven from a going part of the loom, as usual, and in the present mstance, one of the .arms 25 is provided with an extension 26,

' associated rock shaft; that is, each cam 28 is confined to rotation with its associated rock shaft but has longitudinal movement thereon. As shown in the present instance, each cam 28 is isplined to its associated rock shaft 23. by a feather'29, Fig. 4, and a spring 30 interposed between the cam and the collar 31 normally forces the cam 28 into operative engagement with its associated cam 20. As thus far described, it will be apparent that on movement of the bar 25 through its operating means, all of the rock shafts 23 will be given a rocking movement which will be transmitted through the cooperating cams 28 and 20 to the associated vibrator 18.

In accordance with one feature of the present invention, indicators, one for each vibrator, are provided, to indicate the bank of drop wires in which the warp fault has occurred, as will now be explained.

Pivotally supported upon the bracket 10 and preferably on a transversely extending shaft 32 are a series ofindicators 33, the lower end portions 34 of which extend into a circular groove 35formed on the hub portion of the cam 28, the construction being such'that shouldany one of the vibrators 18 be arrested in its oscillatory detecting movement by a fallen drop wire, the cam 28 acting upon the cam 20 will cause the cam 28 to be moved axially of the vibrator 18, or to the left, Fig. 1, against the tension of the spring 30, while the remaining detectors of the series may continue in operation, and such movement of the cam 28 is transmitted to the associated indicator 33, with the result that the bank of drop wires wherein the warp fault'has occurred is visually indicated' to the weaver by the indicator.

In order that the loom'may be stopped when any one of the vibrators 18- is arrested in its oscillatory movement to enable the weaver to piece up the broken end, means are provided to move the dog 6 into the path of the bunter 5.011 the occurrence of a warp fault. I

Each of the indicators is provided with a laterally projecting too 36 upon which rests abar 37' which extends above each one of the toes of the indicators. The bar 37 is connected to a'rock shaft 38 carried by the bracket 10, and in the present r for a'time in operation.

instance, suchc'onnection is made by'means .of a lug 39, the rupstandingend portion 40- of which isopposite the endof the wire 4:1 in the flexible sheath 9, as indicated in Fig.

cator is thus moved-from its normal to its abnormal posltion, the associated toe 36 Wlll act upon the bar 37 and cause the upstanding end of the lug 39 to move the flexible wire 41 longitudinally in its sheath to operatively position the dog 6 for actuation by the lay to effect loom stoppage.

The weight of the bar 37 maybe sufiicient to maintain the parts in normal operative position, as indicated in Fig.3, but if desired, the spring 42 may be connected to the bar 37 and the bracket 10 to maintain the parts in their normal position during weaving.

From the construction described, it will be apparent that during normal weaving operation, the several vibrators 18 are free to be oscillated in the Wide portion ofthe slots 16 of the associated bank of drop wires and the parts will maintain relation, as in diicated in Fig. 3. Should a Warp thread break or become too slack for weaving pur poses, however, the drop wire will fall and arrest movement of the associated vibrator 18, while the other vibrators may continue On the arrest of the detector 18 as described, the cam 20 will likewise be stopped, and since the cam'28 continues in operation through the train of mechanism hereinbefore described, the cam 28 will be moved axially along the shaft 23 and, perforce, move the associated indicator from its normal full line position, Fig. 4, to its dotted line position, to thereby indicate" the bank of drop "wi'resin which the warp fault occurred. As the displaced indicator 33 moves to its abnormal position, its toe 36 will act upon the bar 37 and through the flexible wire 41 effect loom stoppage. Thus it will be seen that the weaver has called to his attention the bank of drop wires in; which the broken or too slack warp thread is associated, and immediately thereafter the loom will be stopped to enable the weaver to piece up the broken or too slack warp thread.

lVhat is claimed is:

1. In a warp stop mechanism for looms, the combination of two or more banks of drop wires, a vibrator for each bank, means for oscillating the vibrators about their longitudinal axes, give-way connections be tween each of the vibrators and the operating means permitting the individual stoppage of the oscillatory movement of any one of the vibrators by a drop wire 011 the occurrence of a warp fault, and an indicator moved by the give-way device on stoppage of the oscillatorymovement of a vibrator by a drop wire to locate the bank of drop wires inwhich the warp fault occurred.

2. In a warp stop mechanism for looms, the combination of a plurality ofbanksof drop wires, an oscillatory vibrator for each bank having a cam connected to each vibrz tor, operating means for the series of vibrators, separate give-way cam connections between said means and each one of the vibrators, and an indicator associated with each one of the give-way cam connections to indicate-v the bank of drop wires in which the warp fault occurred when any one of the vibrators is arrested by a drop wire. 7

In awarp stop mechanism for looms, a bank of drop wires each of which has an opening provided with a wide and narrow portion, a vibrator extending throitigh said opening and having oscillatory detecting movement in the wide portion of the opening during weaving, a cam secured tothe vibrator for movement therewith, means for oscillating the vibrator including a give way cam, and an indicator actuatedby the give-way cam to indicate the location of the warp fault. i

i; In a warp stop mechanism for looms, the combination of a plurality of banks of drop wires, a vibrator for each bank, means for oscillating the vibrators including a separate cam secured toeach vibrator, a rock shaft for each. vibrator having a separate giveqvay cam, yielding means normally acting to maintain the cam and give-way cam of each vibrator in operative relation with permissive separate movement of the cams, means for imparting rocking movement to the rock shafts, a separate indicator con nected to each give-way cam to indicate the bank of drop wires in which the warp fault occurred when a vibrator is arrested by a fallen drop wire, and means for stopping the loom when a vibrator arrested by a drop wire.

5. In a warp stop mechanism for looms,

to stop the loom on occurrence of a warp fault. I

6- In a warp stop mechanism for looms,

the combination of a series of drop wires,

each having an opening with a wide and narrow portion and arranged in a plurality of banks, a vibrator extending through the openings of each bank of drop wires, means for imparting movement to the vibrators about their longitudinal axes within the wide portions of said openings during weav-= ing, and separate ,o ive-way connections bc tween said means and each one of the. vi bra'tors constructed and arranged to permit any one of the vibrators to be individually stopped in its movement by a drop wire.

7. In a warp-stop mechanism for looms,

the combination of a series of drop wires having wide and narrow openings and arranged in a plurality of banks, anoscillatory non-circular vibrator for each bank freely movable in the wide openings of the drop wires during weaving, brackets for supporting the vibrators, a separate indicator for each vibrator pivotally supported vibrator for each bank having a detecting movement adapted to be arrested on theoccurrence of awarp fault, means associated with each vibrator and moved axially thereof when the vibrator is arrested by a dropv wire, and connections between the indicators and axially movable means for movmgthe associated indicator when the vibrator 1s stopped by a drop wire to indicate the bankof drop wires in which the warp fault occn rred.

l). A drop wire bank indicator for warp stop mechanism, comprising a series of indicators, one for each bank of drop wires, a vi- 1 with each vibrator and one of which is moved axially of the vibrator when the vibrator is arrested bya drop wire, and connections between the indicators and the 21X".

ially movable cam for moving the associated indicator when the vibratoris stopped by a drop wire to indicate the bank of drop wires in which the .warp fault occurred. a

10. in a warp stop mechanism for looms, the combination of a series of drop wires each having anopening with a wide and narrow portion and. arranged in a plurality of banks, a vibrator extending-through the openings of each bank of drop wires, means for imparting movement'to the vibrators about, their longitudinal axes withinthe wide portions of said openings during weaving, give-way connections between said 11293118 and each of the vibrators constructed and arranged to permit any one of the vibrators to be individually stopped in its movement by a drop wire, and an indicator actuated by the associated give-way device to indicate in which bank of drop wires the warp t'ault occurred. I

ill-In a warp stop mechanism for looms,

the combination of apluralitv of banks of drop wires normally supported by the warp threads during weaving, a separate vibrator for each bank of drop wires, means for imparting movement to the vibrators, give way connections between said means and each one of the vibrators constructed and arranged to permitany one of the vibrators to be individually stopped in its movement by an associated drop Wire, and a separate indicator for each bank of drop wiresactuated by the associated give way connection to indicate in which bank vof drop Wires the warp fault occurred. 7 I i In testimony whereof, name to this specification.

HARRY A. DAVIS.

I have signed my 

